--- crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68
On Sat, Aug 27, 2016 at 6:54 PM, Vincent Legoll <[email protected]> wrote: > Hi, > > I don't know why, but I was kind of expecting this kind of answer ;-) :) >>> Is the laptop's keyboard only option the >>> Chicony P/N MP-03756GB-5287. >> >> and associated variants, yes. > > In fact the question I had in mind was more: > > If there are such associated variants that can be (almost) drop-in > replacement, but with backlighting... you need *exact* drop-in replacement, not "almost" - tolerances are... what... 0.3mm so the keyboard doesn't fall out? and the connector really does have to be exact. > Because I naively expected the producers to reuse their designs when > adding such slight variations... > > So the answer is no... Too bad pretty mad, huh? >>> Or maybe the laptop case can be modified to allow placement of a few >>> leds around the screen that would get light on the keyboard. I had >>> this on an old T42p and it was better than nothing. >> >> that would be much simpler - it's still abouuut... 2-3 weeks of work, >> redesigning casework > > Ouch, I was thinking of just one or two small holes in the casing, and > friction > slip the LEDs inside... I would not have expected this to take significant > work. It could even be done by careful drilling, without redesign. it's best if you either run the 3D CAD stuff (see the youmagine page), 3d-print a set out, then you'll have a clear idea. you don't really need to drill it (ok you could for a 1st revision). >> that's assuming no LED circuits are needed and >> there's a convenient place to draw power off of. if it was under PWM >> control of something (to change brightness) that's.. 3-5 weeks of PCB >> design work and PCB assembly, 1-2 weeks of component sourcing and >> verification. > > Here I show my almost complete lack of electronics-fu, I thought LEDs > were so low power that they could get piggybacked to the display power > line with just a 1K resistor added, and maybe a switch, to avoid needing > to route a GPIO there just for that. the backlight's at 17v (appx) - LEDs are current-controlled not voltage-controlled, they're not negligeable current, and you really don't want to be overloading the power chip. l. _______________________________________________ arm-netbook mailing list [email protected] http://lists.phcomp.co.uk/mailman/listinfo/arm-netbook Send large attachments to [email protected]
